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Testing for p2la

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This commit is contained in:
Diederik Veeze 2016-06-26 12:50:38 +02:00
parent 12685ef7c1
commit 95de0b6d05
1 changed files with 20 additions and 0 deletions
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20
Tests/test_image_convert.py
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@ -123,6 +123,26 @@ class TestImageConvert(PillowTestCase):
self.assertNotIn('transparency', p.info) self.assertNotIn('transparency', p.info)
p.save(f) p.save(f)
# ref https://github.com/python-pillow/Pillow/issues/1979
def test_p_la(self):
def L(rgb):
return int((rgb[0] * 299 + rgb[1] * 587 + rgb[2] * 114) / 1000)
def convert_to_gray(im, pixel):
if im.mode == 'P':
color_id = im.getpixel(pixel)
color = im.getpalette()[color_id * 3:(color_id+1)*3]
return L(color)
elif im.mode == 'LA':
color = im.getpixel(pixel)
return color[0]
im_p = hopper('P')
im_la = im_p.convert('LA')
self.assertEqual(convert_to_gray(im_p, (5, 5)),
convert_to_gray(im_la, (5, 5)))
if __name__ == '__main__': if __name__ == '__main__':
unittest.main() unittest.main()